#!/bin/bash -e

bv=$(buildah --version)
if (( $? != 0 )); then
    echo install buildah 1.19.3 or later
    exit 1
fi

# translate to array of version components
bv="${bv#buildah version }"
bv="${bv% (*}"
bv=(${bv//./ })

maj=${bv[0]}
min=${bv[1]}
patch=${bv[2]}

ok=$(( maj > 1 || ( maj == 1 && min > 19 ) || ( maj == 1 && min == 19 && patch >= 3 ) ))

if (( ! ok )); then 
    echo install buildah 1.19.3 or later
    exit 1
fi

archs=(amd64 arm64 s390x)

# docker arch has a diffrent spelling than uname arch
arch_uname_amd64=x86_64
arch_uname_arm64=aarch64
arch_uname_s390x=s390x

for arch in "${archs[@]}"; do
    # translate from docker arch to uname arch
    indirect="arch_uname_${arch}"
    arch_uname="${!indirect}"
    if [[ "$(uname -m)" == "${arch_uname}" ]]; then
        continue
    fi
    if [[ ! -f  /proc/sys/fs/binfmt_misc/qemu-"${arch_uname}" ]]; then
        echo install qemu-user-static
        exit 1
    fi
done

buildah bud "${archs[@]/#/--platform=linux/}" --jobs 0 --squash --no-cache --pull -f tools/toolchain/Dockerfile --manifest "$(<tools/toolchain/image)"

echo "Done building $(<tools/toolchain/image). You can now test it, and push with"
echo ""
echo "    podman manifest push --all $(<tools/toolchain/image) docker://$(<tools/toolchain/image)"
